1. Left Edge
4x5 = 20. Carry waits for settle.
4d x 4d (medium th and u)
8 visual steps / multi-digit window train
2. 2-Pair Window
2 pairs: 4x2 + 6x5 = 38. Carry waits for settle.
3. 3-Pair Window
3 pairs: 4x6 + 6x2 + 3x5 = 51. Carry waits for settle.
4. 4-Pair Center
4 pairs = 82. Carry waits for settle.
5. 3-Pair Right Window
3 pairs: 6x5 + 3x6 + 4x2 = 56. Carry waits for settle.
6. 2-Pair Right Window
2 pairs: 3x5 + 4x6 = 39. Carry waits for settle.
7. 1-Pair Right Edge
4x5 = 20. Carry waits for settle.
8. Settle strip
20 | 38 | 51 | 82 | 56 | 39 | 20 -> 24398010.
Practice Level 29
A few quick rounds make the train automatic; each raw window keeps one digit.
Start Level